Sub-nanosecond photolysis studies of Fe2+ protoporphyrin IX solubilized in neat dimethyl sulfoxide

► (DMSO)2Fe(II)PPIX photolysis leads to (DMSO)Fe(II)PPIX formation in <100 ps. ► No DMSO linkage isomerization is observed for the (DMSO)2Fe(II)PPIX complex. ► No base eliminations is observed for the (DMSO)2Fe(II)PPIX complex upon photolysis.